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BUG: Inconsistent behavior with groupby and copy-on-write

Bug

Copy / view semantics

Groupby

Status: Open.

#63219 In pandas-dev/pandas;

· rhshadrach opened on Nov 27, 2025

BUG: Inconsisten nunique behavior with Intervals on latest nightly

Bug

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Status: Open.

#63218 In pandas-dev/pandas;

· cbourjau opened on Nov 27, 2025

API: provide (advanced) utility to update (swap) the underlying array of a Series in-place

API Design

Copy / view semantics

ExtensionArrayExtending pandas with custom dtypes or arrays.Extending pandas with custom dtypes or arrays.

Status: Open.

#63215 In pandas-dev/pandas;

· jorisvandenbossche opened on Nov 26, 2025

DOC: <code>Index.putmask</code> can accept more than <code>np.ndarray[bool]</code> for <code>mask</code>

Docs

IndexRelated to the Index class or subclassesRelated to the Index class or subclasses

Status: Open.

#63209 In pandas-dev/pandas;

· cmp0xff opened on Nov 26, 2025

PDEP-8 inplace keyword deprecation - implementation tracker issue

inplaceRelating to inplace parameter or equivalentRelating to inplace parameter or equivalent

Master TrackerHigh level tracker for similar issuesHigh level tracker for similar issues

Status: Open.

#63207 In pandas-dev/pandas;

· jorisvandenbossche opened on Nov 26, 2025

· 

3.1

BUG: Unexpected <code>TypeError</code> for subclasses of <code>np.ndarray</code> in <code>comparison_op</code>

Bug

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Status: Open.

#63205 In pandas-dev/pandas;

· Julian-Harbeck opened on Nov 26, 2025

DOC: <code>name</code> in <code>Index.to_frame</code> is claimed to default to <code>index.name</code>

Docs

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Status: Open.

#63191 In pandas-dev/pandas;

· cmp0xff opened on Nov 24, 2025

BUG: <code>.loc[:, [*labels]]</code> inconsistently reorders <code>MultiIndex</code>ed <code>Series</code> and <code>DataFrame</code>s

Bug

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

Sortinge.g. sort_index, sort_valuese.g. sort_index, sort_values

Status: Open.

#63187 In pandas-dev/pandas;

· QuaternionsRock opened on Nov 24, 2025

BUG: Arrow duration reduction consistency

Arrowpyarrow functionalitypyarrow functionality

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

Reduction Operationssum, mean, min, max, etc.sum, mean, min, max, etc.

Status: Open.

#63170 In pandas-dev/pandas;

· rhshadrach opened on Nov 21, 2025

BUG: Index.intersection returns reference instead of new instance

Bug

setopsunion, intersection, difference, symmetric_differenceunion, intersection, difference, symmetric_difference

Status: Open.

#63169 In pandas-dev/pandas;

· warwickmm opened on Nov 21, 2025

BUG: read_csv failure to convert dtype is not considered a 'bad line'

Bug

IO CSVread_csv, to_csvread_csv, to_csv

Status: Open.

#63168 In pandas-dev/pandas;

· thijssnelleman opened on Nov 21, 2025

BUG: read_csv segmentation fault in version 2.3.3

Bug

Closing CandidateMay be closeable, needs more eyeballsMay be closeable, needs more eyeballs

IO CSVread_csv, to_csvread_csv, to_csv

SegfaultNon-Recoverable ErrorNon-Recoverable Error

Status: Open.

#63167 In pandas-dev/pandas;

· joachimovesen opened on Nov 21, 2025